Warm blooded vertebrate animals which have hair or fur.Retain the young in their bodies until they are ready to be born. When the young are born they are fed by the mother on milk.Mammals have a highly developed nervous system. They live on land and in the sea.There is a very wide range of types in this group.The largest mammal is the blue whale which often exceeds 30m in length. Shrews, mice and mice which are the smallest are often less than 5cm, excluding their tail.Human beings are mammals.
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